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Finding the Fourth Proportional to 78,915.66, 118,326.26 and 36,805.28

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Solution

The fourth proportional to 78,915.66, 118,326.26 and 36,805.28 is: 55,185.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,915.66 : 118,326.26 = 36,805.28 : x
  2. Step 2: Convert to fraction form
    78,915.66/118,326.26 = 36,805.28/x
  3. Step 3: Cross multiply
    78,915.66x = 118,326.26 × 36,805.28
  4. Step 4: Simplify right side
    78,915.66x = 4,355,031,130.65
  5. Step 5: Solve for x
    x = 4,355,031,130.65/78,915.66
  6. Step 6: Final answer
    x = 55,185.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.